Indeed. To help debug the occasional 'dropped all the cards on the floor' accident, was the diagonal stripe across the side, after the cards have been stacked

Indeed. To help debug the occasional 'dropped all the cards on the floor' accident, was the diagonal stripe across the side, after the cards have been stacked right. This was used for computers for sure, not sure about the Jacquard looms. With complete freedom in addressing (raising) any subset of the warps, these looms were very expressive. My favorite are multi shaft looms. In a k-shaft loom you can only define k elementary subsets of all the warps. Makes for more interesting problem solving instances and mathematical structure.